#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>

#define NEWLINE '\n'

int main() {
  
  char i = 'a';

  if(isupper(i)) {
    printf("a is upper\n");
  }
  
  char ni = toupper(i);
  printf("ni = %c\n", ni);


  return 0;
}